Flexible sensors have received tremendous attention and become one of the research hotspots in recent years owing to their remarkable sensing properties and potential applications in healthcare,consumer electronics and intelligent robots.However,flexible sensors currently still suffer from limitations such as low detection precision and sensitivity,narrow response range,and poor spatial resolution that originate from the physicochemical properties and assembly of the functional nanomaterials in the sensing units.In our recent study,we fabricated a novel photo-electronic coupling flexible sensor by taking advantage of both electronic and optical sensing technique.Au-Ag bimetallic nanocrystals were used as building blocks for the design of electronic sensing unit,while inverse opal structures with viewing angle independent property had been introduced into the optical sensing unit of the developed flexible sensor to improve the detection precision,sensitivity and realize the quantitative detection of pressure(Figure 1).The effect of structure,size,and assembly of the functional building blocks in both electronic and optical sensing units on the electron transport,optical/electrical responsiveness,as well as the sensing mechanism of the resultant flexible sensor had been systematically investigated.We believe this work will provide plenty of inspiration for the design and fabrication of novel flexible sensors with superior properties for a variety of applications.